forked from lthn/blockchain
44 lines
1.5 KiB
C++
44 lines
1.5 KiB
C++
// Copyright (c) 2014-2019 Zano Project
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// Copyright (c) 2014-2018 The Louisdor Project
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// Distributed under the MIT/X11 software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#pragma once
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namespace tools
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{
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namespace db
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{
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typedef size_t container_handle;
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const uint64_t invalid_tx_id = 0;
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struct i_db_callback
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{
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virtual bool on_enum_item(uint64_t i, const void* pkey, uint64_t ks, const void* pval, uint64_t vs) = 0;
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};
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struct stat_info
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{
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uint64_t tx_count;
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uint64_t write_tx_count;
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uint64_t map_size;
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};
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struct i_db_backend
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{
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virtual bool close() = 0;
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virtual bool begin_transaction(bool read_only = false) = 0;
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virtual bool commit_transaction() = 0;
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virtual void abort_transaction() = 0;
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virtual bool open(const std::string& path, uint64_t flags = 0) = 0;
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virtual bool open_container(const std::string& name, container_handle& h) = 0;
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virtual bool erase(container_handle h, const char* k, size_t s) = 0;
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virtual uint64_t size(container_handle h) = 0;
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virtual bool get(container_handle h, const char* k, size_t s, std::string& res_buff) = 0;
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virtual bool set(container_handle h, const char* k, size_t s, const char* v, size_t vs) = 0;
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virtual bool clear(container_handle h) = 0;
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virtual bool enumerate(container_handle h, i_db_callback* pcb) = 0;
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virtual bool get_stat_info(stat_info& si) = 0;
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virtual ~i_db_backend() {};
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};
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}
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}
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